When you assign a NULL value to a variable, you ensure that the variable does not contain any data.

You select a data source to use for the merge in step ____ of the mail merge process.

A. 1 B. 2 C. 3 D. 4

The 5.25 floppy disk was a significant advancement because ________.

A. it had a hard protective case B. they were readily available C. it facilitated saving programs and development of operating systems D. they were on every personal computer